Canadian forward Piers von Dadelszen played in Major League Rugby between 2024-2026. He represented the New England Free Jacks for his entire MLR career.

British Columbia Native von Dadelszen played with the Canadian U18 side, and is a fully capped Canadian international after earning his debut in 2022, and was selected as part of the Canada squad for their November 2023 tests in Spain. He joined the New England Free Jacks from the Oxford University Blues, where he was studying at St Edmunds Hall for his Master’s Degree in Engineering.

The Free Jacks announced the signing of Piers von Dadelszen on 28th October 2023, along with Cameron Nordli-Kelemeti for the 2024 MLR season. He scored 2 tries in 14 games (8 starts) in his debut MLR regular season, completing over 100 successful tackles as the Free Jacks finished atop the Eastern Conference. For his performance in 2024, von Dadelszen was names as Free Jacks Rookie of the Year. Dadelszen started all 3 of the Free Jacks post-season games in 2024 including the Championship game, helping New England triumph over the Seattle Seawolves to lift their 2nd MLR Shield in as many seasons.

On November 13th, 2024, the New England Free Jacks announced the return of Piers von Dadelszen for 2025, again alongside Cam Nordli-Kelemeti, and Tevita Sole. Von Dadelszen started 15 of his 16 appearances for the Free Jacks in 2025, completing just shy of 150 tackles to help New England secure their third (and his 2nd) MLR Shield in a row. His 15 starts and 145 tackles were both career highs. Von Dadelszen was a regular for Canada throughout 2025, starting every single one of their 9 tests that year and while he was touring with the team for their November tests, the New England Free Jacks announced the return of Piers van Dadelszen for his 3rd MLR season in 2026.

achievements:

• 2025 MLR Champion: New England Free Jacks
• 2024 MLR Champion: New England Free Jacks
• 2024 Free Jacks Rookie of the Year
• MLR Team of the Week: 2024 – Rd 12
• MLR Team of the Week: 2024 – Rd 4